Special water drain valve for pipe end of irrigation system

The utility model discloses a special water drain valve for the pipe end of an irrigation system. A sheet rubber stool is installed in a valve body in a matching way. Water drain port and a communicating port are arranged on the end wall of the front part of the valve body. The water drain port is arranged on the inner wall surface of the end wall around the communicating port in a surrounding way. An annular raised platform which encloses the water drain port and the communicating port is arranged on the internal side wall of the end wall. A spiral spring is installed in a pipe body which is arranged on the communicating port surrounded by the annular raised platform. The spiral spring is fixedly connected with the sheet rubber spool in a matching way. The sheet rubber spool can be in full contact with the annular raised platform to plug the water drain port. The utility model has the advantages that the structure is reasonable, the residual water accumulated in the pipe of the irrigation system can be autom